2018 R3 Head Tube Flex??

2018 R3 Head Tube Flex??

I was taking a small amount of play out of the headset last night and when rocking bike forward and back as you do to be sure play is removed; I noticed when rocking bike backwards that flexing movement can be seen at the bottom of the head tube in relation to bottom bearing presumably?
I am not overly concerned as the bike materials need to move or they would fail but was surprised that you can physically see the tube flex out....
Anyone else noticed this when checking headsets setup?
Cheers
Steve